Vitamin B12 (cobalamin) is essential for red blood cells, DNA synthesis, neurological function, myelin sheath, and energy production. Deficiency causes megaloblastic anemia, high homocysteine, cardiovascular issues, tingling, memory loss, fatigue, shortness of breath, mood changes, glossitis, gastrointestinal problems, infections, bruising. Found in animal products; vegans, those with intrinsic factor issues, pernicious anemia, or gastric bypass surgery are at risk. Vitamin B12 (cobalamin) is essential for red blood cells, DNA synthesis, neurological function, myelin sheath, and energy production. Deficiency causes megaloblastic anemia, high homocysteine, cardiovascular issues, tingling, memory loss, fatigue, shortness of breath, mood changes, glossitis, gastrointestinal problems, infections, bruising. Found in animal products; vegans, those with intrinsic factor issues, pernicious anemia, or gastric bypass surgery are at risk. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle